# Science Homework Help

eNotes Homework Help is a way for educators to help students understand their school work. Our experts are here to answer your toughest academic questions! Once it’s posted to our site, your question could help thousands of other students.

• Science
Density is a quantity that is related to both mass and volume. It is usually denoted by the Greek letter "rho" and is calculated as `rho = m/V` , where m is the mass and V is the volume. That is,...

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• Science
The lithosphere is the upper most layer of Earth. It is comprised of all of the Earth's crust and the very upper portion of the mantle. That last upper bit of the mantle is different from the...

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• Science
Overconsumption is the unsustainable use of a resource, such as water, food, materials for shelter, and/or oxygen. An important thing to remember is this can be at the local level or the global...

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• Science
The Universal Law of Gravitation states that any two bodies are attracted to each other by the force of gravity. This force can be calculated using the following formula: `F_(g) = (G*m_1*m_2)/r^2`...

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• Science
10 ml of a 12% solution from a 20% stock We can use the relation: C1V1 = C2V2 where C1 and C2 are the concentrations of solutions and V1 & V2 are the volumes of respective solution. Here, C1 =...

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• Science
Technology is critical to the development of scientific ideas, scientific methods and science. Consider how the development of technical breakthrough helped human beings advance our scientific...

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• Science
Photosynthesis is the process by which plants convert solar energy into usable energy. Plants use light energy from sun, water and carbon dioxide to form glucose molecules, oxygen and energy (in...

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• Science
To answer the question, we must first understand the function of the mitochondria. The mitochondria is a double-membraned organelle of a eukaryotic cell. It is the site of cellular respiration....

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• Science
There are two types of changes that can occur- chemical and physical. Chemical changes are going to produce a new product. They change the chemical composition of a substance. Examples of chemical...

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• Science
Ethanol is an organic compound with molecular formula `C_2H_6O` . It consists of a carbon chain of two atoms that have an -OH group at one end. The chemical formula can be written as `CH_3CH_2OH`...

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• Science
The process involved in the resting potential of a neuron is that the resting potential is created by the transport protein sodium-potassium pump moving Na+ (sodium) to outside the neuron cell and...

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• Science
Our neighboring planets are Venus and Mars. In all, our solar system contains 8 planets : (in order of distance from Sun) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The first...

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• Science
There are a number of properties of liquid that are of use to us. The foremost among them is its volume, even though the shape is not fixed, volume is. Volume is a measure of space occupied by a...

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• Science
When an organism evolves a multicellular body, there are complications that can be addressed by having cells perform different functions. Because cells deeper in the organism depend on surface...

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• Science
A food web is composed of various food chains and includes all the producers and consumers in an ecosystem. Generally, the food web contains primary producers, consumers and predators (of...

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• Science
The vertebrates hearts have the role of pumping blood into the body. Vertebrates possess hearts having different numbers of chambers. Birds and animals possess four chambered hearts, while...

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• Science
Alternative energy sources or non-conventional energy sources are being developed as alternatives to conventional energy sources (most of which are fossil fuels). Alternative energy sources include...

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• Science
Population changes take place due to a number of factors, such as food and resource availability, predation and environmental factors. When the availability of food reduces, population decreases....

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• Science
Nitrogen is one of the elements necessary for animals to sustain life. Nitrogen is essential for all living things. Nitrogen exists in the ground and plants and animals. It is also found in the...

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• Science
The crust of Earth is split into two types: continental crust, oceanic crust. The total average composition of continental crust is similar to granite, which is a felsic rock. The composition of...

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• Science
Temperatures on Earth on are largely dependent on how much energy is received from the sun. A latitude is the angle of measure from the Earth's core to a point on the surface, usually...

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• Science
As far as friction is concerned, the oil will decrease friction between the pad being used to clean and the grit. If you are trying to remove grit that is stuck on a dish, the task is made easier...

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• Science
It is helpful to first know what the words mean prior to determining their location. Symbiosis is when two organisms' lives affect one another in some way. This can be beneficial to both or...

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• Science
The Earth's tilt on is axis is the reasons for seasons. The half of the hemisphere (North or South) that is tilting TOWARD the sun will be either summer or spring with the half that is tilting AWAY...

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• Science
Leaves are a part of plants. Plants are made of plant cells. Unlike animal cells, plant cells contain cell walls. Within these cell walls is a pigment called chlorophyll. It is this chlorophyll...

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• Science
There are a number of disadvantages of computers on the youths: Lack of social interactions: Most of the computers are connected to internet these days. The amount of time youths spend on it,...

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• Science
If you need to perform measurements of volume of a liquid, you may use graduated cylinders. These cylinders come in different sizes, varying from 10mL to 5L. You also may use beakers to measure the...

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• Science
One of the biggest issues in farming these days is how to feed the ever increasing world population, while working under stricter environmental regulations. The demand of commodities (including...

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• Science
Chloroplasts are the organelle, inside the plant cells, responsible for photosynthesis- a process by which light energy is converted to ATPs and oxygen is formed (along with the consumption of...

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• Science
Lipid bilayer of the cell membrane is composed of phospholipids, which are amphiphilic (that is contains both the hydrophobic and hydrophilic ends). The hydrophilic ends points or heads outwards...

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• Science
Our atmosphere is divided into a number of layers. These include troposphere, stratosphere, mesosphere, thermosphere and exosphere. They exist between ground level to 4-12 miles, 4-12 miles to 31...

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• Science
Acidic solutions consists of two water and acid, the water dissolving the acid, which comes in solid form, such as citric acid, or gases. The measurements of pH of an acidic solution is done...

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• Science
Glycolysis is a part of our metabolism and is actually a catabolic process. The entire process consists of ten steps and it results in the breakdown of glucose molecule to pyruvate molecule (which...

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• Science
The formula for acceleration is (final velocity - starting velocity) / time to change velocities. Plug in your values into the formula, and make sure to follow the correct order of operations....

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• Science
The lithosphere is the upper most layer of the earth. It is divided into various tectonic plates. Those plates "float" around on top of the asthenosphere. The asthenosphere is not 100% solid....

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• Science
There can be a number of classifications of industrial waste, based on their phase (solid, liquid or gas), toxicity (toxic or non-toxic), biodegradability (biodegradable or non-biodegradable), etc....

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• Science
You will often find scientists asking "Why" or "why does this happen?", etc. Why is the most common question for scientists. Other questions of interest would be How, when, what (or what if), etc....

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• Science
While conducting any experiment, one has to (try to) minimize errors or inaccuracies. One way to do that is to minimize the variables. While comparing environmental factors (or studying the effect...

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• Science
The main function of the lipid bilayer is the selective permeability i.e., a control on what enters or leaves the cell (and other organelle). Thus, the bilayer is a barrier between the cell (or its...

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• Science
Iron has an atomic number of 26. That means iron has 26 protons and 26 electrons. With those numbers, the atom is neutral. In order to know how many neutrons are in an atom, you must know the...

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• Science
The relation between the angle of incidence and the angle of refraction is known as Snell's Law. Since the light travels with different speed in different media, the direction of the ray of light...

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• Science
The Krebs Cycle represents a series of eight enzymatic reactions occuring in the mitochondrion, generating the energy requested by the production of adensoine triphosphate molecules. The Krebs...

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• Science
Hydrometer is a device which is used to measure the specific gravity of fluids (density with respect to that of water). There are a number of ways, we can make a hydrometer at home or at school....

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• Science
There are a large number of acids in our body, most common of which are nucleic acids, gastric acid and amino acids. The nucleic acids exist in the form of deoxyribonucleic acid (DNA) and...

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• Science
The atomic weight of an element is calculated as the weighted average of the masses of its naturally occurring isotopes. The isotopes are, in simplest terms, forms of an element that have the same...

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• Science
Comparison between two similar ecosystems, different in size, in terms of organism population requires that differences in parameters be analyzed carefully. The parameters that may have a...

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• Science
Sodium oxide can be formed by burning sodium in air using the following chemical reaction: `2 Na + 1/2 O_2 -> Na_2O` i.e. 2 moles of sodium will produce one mole of sodium oxide. The atomic...

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• Science
To understand how the neurosystem communicates, one needs to have an understanding of the components involved in the process. The human body has a central nervous system that handles assisting...

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• Science
This question is based on the density of the two substances. Density is defined as mass per volume. Thus, Density = Mass / Volume Using this formula, the density of the coconut oil is: 92.4 grams...

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